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IBM 3720 Models 1,2,11, and 12
IBM 3721 Models 1 and 2
Communication Controllers

Extended Services




System/370, 30xx, 4300,
and 9370 Processors

Publication Number File Number
GA33-0066-2 S370/30xx/4300/9370-09
Third Edition (July 1988)

This major revision replaces and obsoletes GA33-0066-1.

Changes or additions to the text and illustrations are indicated by a vertical line to the left of the change.
The only major change in this revision is the insertion of a new Chapter 18, which describes 'Disk IPL
Information.'

Reference in this publication to IBM products, programs, or services does not imply that IBM intends to
make these available in all countries in which IBM operates. Any reference to an IBM licensed program in
this publication is not intended to state or imply that only IBM's licensed program may be used. Any
functionally equivalent program may be used instead.

The information contained in this manual is subject to change from time to time. Any such changes will be
reported in subsequent revisions or Technical Newsletters.

Publications are not stocked at the addresses given below. Requests for IBM publications should be made to
your IBM representative or to the IBM branch office serving your locality.

A form for reader's comments is provided at the back of this publication. If the form has been removed,
comments may be addressed to either of the following: